Tower fan



FIG. 1 is a front view of a tower fan showing our new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right side view thereof.

The broken lines in the drawings depict parts of the tower fan that form no part of the claimed design. 

CLAIM We claim the ornamental design for a tower fan, as shown and described. 